package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;


public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取token
        String token = request.getHeader("authorization");
        // 判断token是否存在
        if(StrUtil.isBlank(token)){
            // 如果不存在，则放行
            return true;

        }
        // 2.基于token获得userDTO
        Map<Object, Object> map = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        // 3.判断map是否存在
        if (map.isEmpty()) {
            // 4.如果不存在则放行
            return true;
        }
        // 5.如果存在，则将查询到的map转换为userDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(map, new UserDTO(), false);
        // 6.然后将其存储到ThreadLocal中
        UserHolder.saveUser(userDTO);
        // 7.刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //及时销毁，防止内存泄露
        UserHolder.removeUser();
    }
}
